Fig. 6From: Regulation of YKL-40 expression by corticosteroids: effect on pro-inflammatory macrophages in vitro and its modulation in COPD in vivoSputum and serum YKL-40 protein levels of COPD patients before and after ICS treatment. YKL-40 levels in sputum and serum at baseline (0) and after 30Â months (30Â m) of inhaled corticosteroids (ICS) and placebo. For comparison of the levels between baseline and 30Â months, we only included patients from whom samples were available at both time points (paired data). Each dot represent a single patient, red horizontal bars represent mediansBack to article page